SU1305327A1 - Method of measuring temperature in well - Google Patents

Abstract

The invention relates to a measurement technique used in the drilling of oil and gas wells. The purpose of the invention is to improve the accuracy and reliability of temperature measurement in a well filled with oil or mud. A sensor (D) of a temperature transducer is installed in the controlled well of the well. In the process of moving the transducer along the wellbore, oscillations are imposed on D in the frequency range of 1-100 Hz with an amplitude of oscillation (AA) of 0.3-10 mm in a viscous medium or 0.1-10 mm in water. After oscillation, temperature is recorded. These values of AK are close to the thickness of the boundary layer of the environment surrounding D. This provides a sharp decrease in thermal inertia D. The lower boundaries of the decrease in thermal inertia D are due to the lower boundaries of AK and frequency. The upper boundary of the AK is due to the rigidity of the protective shell D and the structural limitations of its transverse dimensions. Upper graley- ts oscillation frequency due to the strength of D. 2 Il. "(L

Description

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11305327

The invention relates to the field of measuring the temperature distribution of a wellbore filled with a liquid or gaseous medium, and can be applied to measure the temperature in a well, filled with oil or mud.

The aim of the invention is to improve the accuracy and reliability of temperature measurement in a well.

1 shows a temperature transducer sensor; FIG. 2 shows the dependence of the thermal index of the protective shell of the transducer, j

Temperature Applicant versus Frequency and Amplitude of Oscillations in Transformer Oil.

The sensor 1 of the temperature transducer is protected by a tubular sheath attached to the sealed casing 2 of the downhole tool, in which the block 3 converts the output signal of the sensor into an electrical frequency signal. A power cable 4 is connected to housing 2. To reduce thermal inertia, the sensor further comprises an electromagnetic vibrator 5, fixedly fixed relative to the housing 2 of the downhole tool, the input of which is connected to the output of the generator 6 of a low-frequency electrical signal. The anchor of the vibrator 5 is mechanically connected to the protective sheath of the sensor 1.

The method is carried out as follows.

A temperature transducer sensor is installed in the controlled area of the well, oscillations are applied to it and the temperature is recorded. The oscillations are superimposed on the temperature transducer sensor in the i-100 Hz frequency range with an oscillation amplitude of 0.3-10 mm in a viscous medium or 0.1-10 mm in water in the process of moving the transducer to the wellbore.

Based on experimental data

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t eff d

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t or p p and p p

t k l t n

P

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t

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P

The greatest influence on the effect of reducing the thermal inertia of the thermal thermal inertia of the transducer transducer temperature transducer temperature sensor has an increase in the amplitude of oscillations. The increase in the oscillation frequency has

with

values

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c to value

less effect on the decrease effect. Kazatel thermal inertia sensesV ..- JJ

thermal inertia

The principal difference of the proposed method is that the values of the amplitude of oscillations are close to the toltemic element c. Accepted from 1.5 s, which corresponds to the results of tests of modern downhole temperature transducers

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thermal boundary layer environment surrounding the temperature converter sensor. This provides a sharp decrease in thermal inertia of the specified sensor.

The lower boundaries of the amplitude and frequency of oscillations are due to a decrease in the effect of reducing the thermal inertia of the temperature transducer sensor.

The upper limit of the amplitude oscillates due to the rigidity of the protective sheath of the sensor of the temperature transducer and the design limitations of its transverse dimensions.

The upper limit of the oscillation frequency is due to the strength of the specified sensor. For example, when the oscillation frequency is f 100 Hz and the amplitude of oscillation is А 1 mm, the sensitive element of the temperature transducer sensor experiences an acceleration of 36 g.

In the proposed method, transverse oscillations of the transducer r of the temperature transducer are preferred, since the longitudinal vibrations are less effective and complicate the design of the borehole temperature transducer and do not destroy the thermal boundary layer surrounding the protective sheath of this transducer.

Example. Experimental studies of the dependence of the thermal inertia index of the protective sheath of the temperature converter sensor on the transverse vibration mode are carried out. The diameter of the containment is 3.5 mm, the wall thickness is 0.6 mm. The studies were carried out in a viscous fluid — transformer oil (analogous to the oil medium) and in water.

The results of studies of Tp values in transformer oil (Fig. 2) show that the sensor oscillations in the mode: amplitude A 2.5 mm, often

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that f 8 Hz causes a decrease in Cpg; from value

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 12 C at A o up to a value of C 1.1 s.

This result is equivalent to a decrease in the thermal inertia of the temperature sensor transducer.

with

values

Neither € 2,6 s, i.e. in the definition of the indicator

 13.5 5

c to value (at € value by

body element with. is taken as equal to 1.5 s, which corresponds to the results of tests of modern well temperature transducers.

The value of T is determined by the approximate formula C X +; the error in determining this formula does not exceed 5%).

Claims (1)

Invention Formula A method of measuring the temperature in a well, including the installation of a sensor in the well controlled area 7 temperature transducer, the imposition of fluctuations on it and the registration of temperature, characterized in that, in order to improve the measurement accuracy and reliability, the imposition of oscillations on the temperature transducer sensor is performed in the frequency range 1-100 Hz with an amplitude of 0.3-10 mm in medium or 0.1-10 mm in water. .2н1 A 0  2.5 city / 2,816 Oscillation frequency of Sensor j, Hz FIG. 2 Editor N.Lazarenko Compiled by G. Maslova Tehred A. Kravchuk Order 1404/29 Circulation 533 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 50 Corrector S.Cherni